JP3822882B2 - GAME PROGRAM AND GAME DEVICE - Google Patents

Description

The present invention is a game program and a game suitable for application when a plurality of polygon models composed of a plurality of polygons such as trees are arranged as fixed objects in a field set in a three-dimensional virtual space. Relates to the device.

  In this specification, “game software” is a concept including the program itself and various data associated with the program as necessary. However, “game software” does not necessarily have to be associated with data, but a program always exists. The “various data associated with each other” may be stored in a memory means such as a ROM disk together with a program, and further stored in an external memory means so as to be readable via communication mediating means such as the Internet. It may be.

    Conventionally, in this type of game software, when a plurality of polygon models composed of a plurality of polygons such as trees are arranged as fixed objects in a field set in a three-dimensional virtual space, A memory area corresponding to the total number of objects to be arranged in the memory is secured in advance, and these objects are displayed.

    In addition, the applicant has a system for how to realize a polygon model composed of a plurality of polygons as a fixed object in a field set in a three-dimensional virtual space. There is no prior art that should be disclosed because we do not know the literature described in detail.

    However, in this case, it is necessary to secure a memory area corresponding to the total number of objects to be arranged in the entire field, resulting in a disadvantage that the display memory area becomes large.

In view of the circumstances described above, the present invention provides a small display when a plurality of polygon models composed of a plurality of polygons such as trees are arranged as fixed objects in a field set in a three-dimensional virtual space. It is an object of the present invention to provide a game program and a game apparatus that can efficiently represent those objects with a memory capacity.

According to the first aspect of the present invention, only a part of a predetermined number or less of a plurality of objects fixedly arranged on a field (FLD) generated in the three-dimensional virtual space is stored in the three-dimensional virtual space. A game program (GPR) for causing a computer to execute a procedure of selectively acquiring from a placed virtual camera (31) and displaying the same on a monitor (9),
The game program is stored in the computer,
A field generation procedure for generating the field for a character in the game to act in the three-dimensional virtual space;
Display information storage areas (for example, memory areas A and B in FIG. 3) for storing display information (DIN) corresponding to the arrangement positions of the objects on the field for the predetermined number or less of objects displayed on the monitor. , C, D) memory area setting procedure for securing and setting memory in a fixed size,
Based on the fixed object arrangement position stored in the memory of the computer and the position of the virtual camera in the three-dimensional virtual space, the number of objects equal to or less than the predetermined number acquired by the virtual camera and the position thereof are determined. Search operation, object search procedure,
A display information calculation storage procedure for calculating the display information when the objects calculated by the object search procedure are arranged at respective positions on the field and storing the calculated display information in the display information storage area;
Based on the display information calculated and stored in the memory, an image to be displayed is generated for the objects of the predetermined number or less acquired by the virtual camera searched and calculated by the object search procedure, and is displayed on the monitor. Image generation display procedure to be displayed,
When the placement position of the virtual camera moves in the three-dimensional virtual space, a command for causing the object search procedure to search again for the number of objects equal to or less than the predetermined number acquired by the moved virtual camera and its position. procedure,
It is comprised as a game program for performing .

    According to a second aspect of the present invention, the fixed object includes a polygon model (30) modeled from a plurality of polygons.

    According to a third aspect of the present invention, in the display information calculation storage procedure, shading information and texture information when the object searched and calculated by the object search procedure is arranged at each position on the field are displayed information. As a feature.

According to a fourth aspect of the present invention, the game program is further stored in the computer.
A change detection procedure for monitoring the number of objects equal to or less than the predetermined number searched by the object search procedure and a change in the position before and after the placement position of the virtual camera in the three-dimensional virtual space is changed;
An object detection procedure for detecting an object for which display information (DIN) must be newly calculated by the display information calculation storage procedure by changing the position of the virtual camera based on the monitoring result of the change detection procedure;
A display information calculation instruction procedure for instructing the display information calculation storage procedure to store the display information of the object which has been detected by the object detection procedure and for which display information must be newly calculated;
It is comprised as a game program for performing .

In the invention of claim 5, among a plurality of objects fixedly arranged on the field generated in the three-dimensional virtual space, only a part of a predetermined number or less of the objects are arranged in the three-dimensional virtual space. A game device having means for selectively acquiring from a virtual camera and displaying on a monitor,
The game device includes:
Field generating means for generating the field for the character in the game to act in the three-dimensional virtual space;
For said predetermined number following objects to be displayed on the monitor, memory to ensure setting a display information storage area for storing display information corresponding to the position on the field of the object in a fixed size in the memory Area setting means,
Based on the fixed object arrangement position stored in the memory of the computer and the position of the virtual camera in the three-dimensional virtual space, the number of objects equal to or less than the predetermined number acquired by the virtual camera and the position thereof are determined. Object search means for performing search operations,
Display information calculation storage means for calculating the display information when the object searched for by the object search means is arranged at each position on the field and storing it in the display information storage area;
Based on the display information calculated and stored in the memory, an image to be displayed is generated for the objects equal to or less than the predetermined number acquired by the virtual camera searched and calculated by the object search means, and is displayed on the monitor. Image generation and display means for displaying;
When the placement position of the virtual camera moves in the three-dimensional virtual space, a command for causing the object search means to search again for the number of objects equal to or less than the predetermined number acquired by the moved virtual camera and its position. means,
It is comprised.

    According to the first and fifth aspects of the present invention, display information (DIN) for a predetermined number or less objects to be displayed on the monitor among a plurality of objects fixedly arranged on the field (FLD) is stored. Display information storage areas (for example, memory areas A, B, C, and D in FIG. 3) are secured and set in a fixed size in the memory, and the number of objects equal to or less than the predetermined number acquired by the virtual camera and its The position is searched and calculated, the corresponding display information (DIN) is stored in the display information storage area, and the image of the object is displayed on the monitor (9). Further, when the placement position of the virtual camera moves in the three-dimensional virtual space, the number of the objects equal to or less than the predetermined number acquired by the moved virtual camera and the position thereof are again searched and calculated, and the display information storage area The image is displayed on the monitor (9) based on the stored display information (DIN). This makes it possible to display objects on the field while using a display information storage area having a limited memory capacity.

    In the invention of claim 2, when the fixed object is a polygon model (30) modeled from a plurality of polygons, the display information (DIN) has a large capacity, but the display information storage area for storing it is used. These polygon models can be expressed efficiently by turning.

    In the invention of claim 3, since shading information and texture information are stored in the display information storage area as the display information, each object can be appropriately rendered based on the display information (DIN).

    In the invention of claim 4, even when the arrangement position of the virtual camera (31) is changed, the display information (DIN) is calculated and stored only for the object that needs to be newly calculated. It can be reduced.

    Note that the numbers in parentheses are for the sake of convenience indicating the corresponding elements in the drawings, and therefore the present description is not limited to the descriptions on the drawings.

    Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a control block diagram of a game machine to which the present invention is applied, FIG. 2 is a schematic diagram showing an example of a plurality of fixed objects arranged in a three-dimensional virtual space, and FIG. FIG. 4 is a schematic diagram illustrating an example of a display memory used when displaying an object, FIG. 4 is a schematic diagram illustrating a relationship between a virtual camera and a view volume, and FIG. 5 is a flowchart illustrating an example of an object arrangement processing procedure. is there.

    As shown in FIG. 1, the game apparatus 20 executes a predetermined game according to a game program such as an adventure game recorded on a ROM disk 15 as a recording medium. The game device 20 includes a CPU 1 mainly composed of a microprocessor, a ROM 2 and a RAM 3 as main storage devices for the CPU 1, an image processing device 4 and a sound processing device 6, and buffers 5 and 7 for these devices. And a ROM disk reader 8. In the ROM 2, an operating system is written as a program necessary for overall operation control of the game machine. In the RAM 3, a game program and data read from the ROM disk 15 as a storage medium are written as necessary. The image processing device 4 receives the image data from the CPU 1 and draws a game screen on the frame buffer 5, converts the drawn image data into a predetermined video reproduction signal, and outputs it to the monitor 9 at a predetermined timing. . The sound processing device 6 reproduces data such as voice and musical sound, sound source data and the like read from the ROM disk 15 and recorded in the sound buffer 7 and outputs them from the speaker 10. The ROM disk reader 8 reads a program or data recorded on the ROM disk 15 in accordance with an instruction from the CPU 1 and outputs a signal corresponding to the read content. The ROM disk 15 stores programs and data necessary for game execution. The monitor 9 generally uses a home television receiver, and the speaker 10 generally uses a built-in speaker of the television receiver.

    Further, a communication control device 11 is connected to the CPU 1 via a bus 14, and a controller 12 and an auxiliary storage device 13 as input devices are detachably connected to the device 11 via appropriate connection ports. The controller 12 functions as an input device, and is provided with operation members such as operation keys for accepting operations by the player. The communication control device 11 scans the operation state of the controller 12 at a constant cycle (for example, 1/60 seconds), and outputs a signal corresponding to the scanning result to the CPU 1. The CPU 1 determines the operation state of the controller 12 based on the signal. A plurality of controllers 12 and auxiliary storage devices 13 can be connected to the communication control device 11 in parallel.

    In the above configuration, the other components excluding the monitor 9, the speaker 10, the controller 12, the ROM disk 15, and the auxiliary storage device 13 are integrally accommodated in a predetermined housing to constitute the game machine body 16. The game machine body 16 functions as a computer.

    Stored on the ROM disk 15 is game software GPR such as an action game, a role-playing game, or an adventure game, in which the game progresses according to a predetermined scenario.

    In the game apparatus 20, when a predetermined initialization operation (for example, a power-on operation) is performed, the CPU 1 first executes a predetermined initialization process according to the program in the ROM 2. When the initialization is completed, the CPU 1 starts reading the game software GPR stored on the ROM disk 15, and starts the game process according to the program. When the player performs a predetermined game start operation on the controller 12, the CPU 1 starts various processes necessary for executing the game according to the procedure of the game software GPR based on the instruction.

    Thereafter, the game apparatus 20 performs a predetermined process according to the read game software GPR, performs display control of an image displayed on the monitor 9, and performs progress control of a predetermined scenario.

    In the game device 20 having the above-described configuration, games of various genres can be played on the screen of the display 9 by loading the program recorded on the ROM disk 15 into the RAM 3 and executing it by the CPU 1.

  In addition, although the game machine 1 as a household game machine was demonstrated as an example as a computer which functions the game software which concerns on this invention, this game machine 1 may be what is called a portable game machine, Furthermore, In addition to a device dedicated to a game, it may be a device capable of playing back general music and video recording media, and is not limited to this, and as a computer, for example, a personal computer, a mobile phone, etc., that is, game software Any device may be used as long as it can function.

  As long as various programs and various data constituting the game software GPR are freely readable by the program function of the game software GPR, the storage mode is arbitrary, as in this embodiment. In addition to being stored in the ROM disk 15 together with the game software GPR program, the game software GPR is stored in an external memory means such as a server independent of the game machine 1 and is read by a read program provided in the game software GPR. Alternatively, the information may be downloaded to a memory such as the RAM 3 via communication mediating means such as the Internet.

    As shown in FIGS. 1 and 2, the game by the game software GPR is performed on the field FLD set in the three-dimensional virtual space 40 generated by the CPU 1 in the RAM 3 by the field generation program FPP of the game software GPR. The game is set as a so-called action game in which a player moves a character (not shown) that can be operated via the controller 12 while fighting with an enemy character and proceeding with a scenario.

    In the game software GPR shown in FIG. 1, only software elements related to the present invention constituting the game software GPR are described, and the game software GPR describes in FIG. In addition to the above, various programs and data necessary for executing a game using the game software GPR are stored.

    At the start of the game, the field generation program FPP is a field for the action of a character (not shown) that is moved and controlled based on the operation of the controller 12 of the player in the game in the three-dimensional virtual space 40 via the CPU 1. An FLD is generated (step S1 in FIG. 5). When the field FLD is generated in the three-dimensional virtual space 40, the tree arrangement program TDP constituting the game software GPR is activated, and the tree arrangement program TDP is based on the tree arrangement file TDF constituting the game software GPR. The tree polygon model 30 representing a tree is arranged as a fixed object at a plurality of world coordinate positions on the generated field FLD.

    The tree polygon model 30 arranged in the field FLD is modeled from a large number of polygons. Normally, one or more types of models are designed as the tree polygon model 30 so that they can be arranged in the field FLD. The polygon model data file PMF stores polygon model data PMD.

    In the tree arrangement file TDF, the world coordinate position indicating the arrangement position of the tree polygon model 30 as the object to be arranged in the field FLD, the type of the polygon model 30 to be arranged (when a plurality of polygon models 30 are set), and The three-dimensional geometric transformation information such as the orientation and scale of the polygon model 30 when the polygon model 30 is arranged is stored as model arrangement information MDI in a form set for each arrangement position.

    In the field FLD shown in FIG. 2, for example, 40 tree polygon models 30 are set to be arranged as objects. In this case, the 40 tree polygon models 30 are stored in the tree arrangement file TDF. The above-described model arrangement information MDI is stored for each position to be arranged. Therefore, the tree arrangement program TDP can arrange the tree polygon model 30 at a predetermined position in the field FLD based on the model arrangement information MDI of the tree polygon model 30 indicated in the tree arrangement file TDF.

    By the way, as shown in FIG. 2, the video displayed on the monitor 9 is based on a game coordinate system 33 based on a camera coordinate system 33 set with a virtual camera 31 set at an appropriate position in the three-dimensional virtual space 40 as a viewpoint. The CPU 1 and the image processing device 5 calculate and generate the wear GPR image generation program PPP.

    As shown in FIGS. 2 and 4, the virtual camera 31 and the camera coordinate system 33 are set with a quadrangular pyramid viewing angle region 32 defined by the horizontal viewing angle α and the vertical viewing angle β. Are set with a front clipping plane 32a and a rear clipping plane 32b that define the projection range of the object in the three-dimensional virtual space 40. A projection plane 32d is set between the front clipping plane 32a and the rear clipping plane 32b. The projection plane 32d is sandwiched between the front clipping plane 32a and the rear clipping plane 32b of the viewing angle region 32. An image is acquired in a form in which an object included in the view volume 32c, which is a region, is perspective-transformed and projected.

    When the image generation program PPP acquires the image of the field FLD using the virtual camera 31, as described above, the image generation program PPP moves the virtual camera 31 to an appropriate position in the three-dimensional virtual space 40 (usually, the player passes through the controller). And the Z axis of the camera coordinate system 33, that is, the orientation of the virtual camera 31 is set to a predetermined direction. At this time, the image generation program PPP has several tree polygon models 30 as fixed objects on the field FLD acquired as one screen by the virtual camera 31 via the CPU 1, for example, two or three. As described above, the value is set so as to be significantly smaller than the total number of fixed objects arranged on the field FLD. This is possible by appropriately adjusting the viewpoint position of the virtual camera 31 and the direction of the camera coordinates in the Z-axis direction. Further, when setting the model arrangement position of each fixed object at the stage of creating the game software GPR, the position of the virtual camera 31 is assumed in advance, and the fixed position acquired by the virtual camera 31 on one screen is assumed. You may make it set the arrangement position so that the number of objects may be below a predetermined maximum drawing number.

    The image generation program PPP stores the tree arrangement file TDF stored in the game software GPR from the ROM disk 15 into the RAM 3 as the main storage device, and is arranged on the field FLD stored in the tree arrangement file TDF. Subsequent processing is performed on the basis of model position information MDI indicating the position of the fixed object to be fixed, arrangement mode data indicating the arrangement mode of the polygon model or the like at the position. The fixed objects placed in the field are not limited to trees, but other objects are also set. Here, in order to simplify the explanation, the game software GPR includes a fixed object placement file. Assume that only a tree arrangement file TDF storing arrangement data of only tree objects is set. Therefore, it is assumed that the tree arrangement file TDF stores data for setting objects representing trees as a fixed object at a plurality of locations on the field FLD.

    At the same time, the image generation program PPP is arranged via the CPU 1 as an object in the field FLD in the set view volume 32c of the virtual camera 31 and is supposed to be acquired as an image on the projection surface 32d as a result of the perspective transformation. The number of tree polygon models 30 and their positions in the three-dimensional virtual space are searched and calculated based on the model position information MDI of the tree arrangement file TDF and the arrangement position data of the virtual camera 31 in the three-dimensional virtual space (FIG. 2 step S2).

    That is, for example, the tree polygon model 30 arranged as a fixed object in the field FLD is converted from the model position information MDI of the tree arrangement file TDF as shown in FIG. When calculated as shown in 5..., Based on the arrangement position data of the virtual camera 31, if the virtual camera 31 is at the position (a), it should be selectively acquired as an image on the projection surface 32 d. The tree polygon models 30 are three model numbers 1, 2 and 3, and when the virtual camera 31 is at the position (b), the number of tree polygon models 30 that should be acquired as images on the projection surface 32d. Is the model number 2, 3 and 4, and when the virtual camera 31 is at the position (c), the tree polygon model that should be acquired as an image on the projection surface 32d The number of 0, the three model number 2, 4 and 5. Thus, the model number of the tree polygon model 30 that has been calculated and determined as an object to be acquired as an image and therefore to be displayed on the monitor 9 is recorded in a predetermined memory.

    In the image generation program PPP, the maximum number of tree polygon models 30 as fixed objects on the field acquired on one screen by the virtual camera 31 is set as the maximum number of drawing, and the image generation program PPP is The CPU 1 calculates and sets a memory area for storing display information DIN, which will be described later, of the object corresponding to the maximum number of drawn lines as a fixed area in the RAM 3 as the main storage device. The maximum number of drawn lines is set to about 1/10 (for example, 4) of the total number (for example, 40) of the tree polygon models 30 as objects arranged on the field.

    As a result of the perspective transformation, when the number of tree polygon models 30 that should be acquired as images on the projection surface 32d is the maximum drawing number, for example, four or less, the image generation program PPP displays on the monitor 9 The tree polygon model 30 having a predetermined model number that has been determined as the power tree polygon model 30 is determined as a display model (step S4 in FIG. 5).

    In addition, when it is calculated that a predetermined maximum number of drawings, for example, five or more tree polygon models 30 are acquired as images on the projection surface 32d, the image generation program PPP starts from the arrangement position of the virtual camera 31 to the camera. In the Z-axis direction of coordinates, the tree polygon models 30 up to the maximum number of drawing (for example, four) from the order close to the virtual camera 31 are determined as the tree polygon models 30 to be acquired, and the model numbers are stored in the memory. Recording is performed (step S5 in FIG. 5).

    Now, if the virtual camera 31 is placed at the position (a) in FIG. 2, the tree polygon model 30 that is calculated and determined as an object to be displayed on the monitor 9 by the image generation program PPP and CPU 1 is the model number. Becomes the tree polygon model 30 of 1 to 3. Next, the image generation program PPP arranges the tree polygon model 30 at the corresponding position on the field FLD from the model position information MDI for the model numbers 1 to 3 via the CPU 1 and the image processing device 4. For the tree polygon model 30 of each model number, display information DIN corresponding to the arrangement position on the field FLD at the time of rendering by the virtual camera 31 is calculated (step S6 in FIG. 5). Each obtained display information DIN is stored in a predetermined memory area A, B, C, D in the RAM 3 in a form corresponding to each model number, as shown in FIG.

    Then, a predetermined number (three in this case) of the tree polygon models 30 arranged on the field FLD is rendered based on the display information DIN in the RAM 3 to generate a display image (step S7 in FIG. 5).

    This display information DIN is information necessary for generating an acquired image when the tree polygon model arranged on the field FLD is obtained by rendering from the arrangement position of the virtual camera 31 described above. For example, the color and intensity of the reflected light based on the light source information at the arrangement position on the field FLD of each tree polygon model 30 and the reflectance and color information set for each of the polygons constituting each tree polygon model 30. The display information DIN is calculated for each arrangement position of each tree polygon model 30, and the above-described model is the shading information and the texture information that is changed as necessary according to the arrangement position of the tree polygon model 30. Stored in the memory areas A, B, C, and D of the RAM 3 corresponding to the numbers, respectively.

    As already described, since the tree polygon model 30 on the field FLD acquired by the virtual camera 31 is only for the three model numbers 1 to 3, the memory area of the RAM 3 for storing the display information DIN is 3 Only this area is required, and it is not necessary to calculate and store all the tree polygon models 30 to be arranged on the field FLD indicated in the tree arrangement file TDF. Therefore, a memory area for storing the display information DIN can be greatly saved. Normally, the display information DIN is calculated for each vertex of each polygon constituting the tree polygon model 30, so that the amount of data increases as the number of polygons in the tree polygon model 30 increases.

    In the memory area of the RAM 3, as shown in FIG. 3, a tree polygon model for four trees corresponding to the maximum drawing number is used as an area for storing display information DIN about the image of the object acquired from the field FLD. A storage area for 30 is secured in advance.

    In this way, when the position of the virtual camera 31 in FIG. 2 is (a), the display information DIN of each position of the tree polygon model 30 arranged at the arrangement positions of the model numbers 1 to 3 is the image generation program PPP. And calculated by the CPU 1 and stored in the memory areas A, B, and C of the RAM 3 in a form corresponding to each model number, as shown in FIG. Based on the display information DIN, an image rendered from the virtual camera 31 is generated and displayed on the monitor 9.

    Regarding the memory area D, since there are no tree polygon models 30 acquired by the virtual camera 31 at the position (a) other than the three model numbers 1 to 3, nothing is stored. At this time, in preparation for the movement of the virtual camera 31 to be described later, the tree polygon model 30 of the object whose model number is 4 adjacent to the model number 3 (current position (a) of the virtual camera 31 (see FIG. 2)). The display polygon D30 of the object with the model number 4 is outside the view volume 32c and is not displayed on the monitor 9), and the display information DIN is also calculated at the same time and stored in the memory area D of the RAM 3 in FIG. It may be stored as shown in FIG.

    Thus, the three tree polygon models 30 arranged on the field FLD in a form included in the view volume 32c of the virtual camera 31 arranged at the position (a) are actually arranged on the field FLD, and the virtual camera 31 Thus, the video is acquired. However, the position of the virtual camera 31 may move from the position (a) shown in FIG. 2 to the position (b) or the position (c) by a command generated based on an operation via the player's controller 12 or the like. is there.

    When the virtual camera 31 moves, the image generation program PPP is again arranged as an object in the field FLD in the view volume 32c of the virtual camera 31 via the CPU 1, and as an image on the projection surface 32d as a result of the perspective transformation. The tree polygon model 30 that should be acquired is searched and calculated based on the model position information MDI and the arrangement position data of the virtual camera 31 in the three-dimensional virtual space (steps S8 and S2 in FIG. 2).

    If the position of the virtual camera 31 changes, the tree polygon model 30 on the field FLD will naturally change as a result of the perspective transformation and should be acquired as an image on the projection plane 32d. That is, for example, in the case of FIG. 2, when the virtual camera 31 is moved from the position (a) to the position (b), the image generation program PPP is acquired again as an image on the projection surface 32d via the CPU 1. A routine for instructing itself to calculate the number of tree polygon models 30 and their positions is executed, and in response to this, the image generation program PPP executes step S2 in FIG. 5 again to execute the projection plane 32d. The tree polygon model 30 that should be acquired as an image is searched and calculated from the three model numbers 1, 2, and 3 up to the model numbers 2, 3, and 4. Although description of the calculation from step S3 to step S5 regarding the maximum number of drawn lines in FIG. 5 is omitted, the same processing as described above is performed and acquired as an image on the projection surface 32d after the position of the virtual camera 31 is changed. An operation for determining the tree polygon model 30 to be performed is performed.

    Then, the image generation program PPP arranges the tree polygon model 30 at the corresponding position on the field FLD from the model position information MDI for the model numbers 2 to 4 via the CPU 1 and the image processing device 4, and For the tree polygon model 30 of the model number, display information DIN corresponding to the arrangement position on the field FLD at the time of rendering by the virtual camera 31 is calculated (step S6 in FIG. 5).

    The image generation program PPP monitors changes in the number and position of objects acquired by the virtual camera 31 before and after the placement position of the virtual camera 31 in the three-dimensional virtual space is changed via the CPU 1. Due to the change of the position of the virtual camera 31, the display information DIN must be newly calculated, and as a result of the movement of the virtual camera 31, the virtual camera 31 becomes out of the view volume 32 c of the virtual camera 31. A procedure for detecting an object that no longer requires the stored display information DIN is executed.

    That is, when the placement position of the virtual camera 31 is moved from the position (a) to the position (b), the object acquired by the virtual camera 31 by the object search procedure is determined from the model numbers 1, 2, and 3. Model numbers 2, 3, and 4. As a result, the image generation program PPP uses the CPU 1 to newly display the object with the model number 4 as an object for which the display information DIN has to be calculated, and the display information DIN. An object having a model number of 1 is detected as an object that is no longer necessary.

    Next, the image generation program PPP executes a routine for instructing itself to calculate the display information DIN for the tree polygon model 30 constituting the object with the model number 4 via the CPU 1 from the detection result, In response to this, the image generation program PPP calculates the display information DIN for the tree polygon model 30 constituting the object whose model number is 4, and the calculation result is stored in the memory of the RAM 3 in which the display information DIN is not yet stored. The area D is stored as shown in FIG.

    As a result of such processing, the display information DIN for the tree polygon models 30 of model numbers 2 and 3 has already been calculated and stored in the memory areas B and C of the RAM 3, so that the calculation of the display information DIN It is sufficient to carry out only for the tree polygon model 30 of number 4. Based on the display information DIN of the tree polygon model 30 of the model numbers 2 to 4 stored in the memory areas B, C, and D of the RAM 3 via the CPU 1, the image generation program PPP is generated from the virtual camera 31 with the three of them. An image obtained by rendering the tree polygon model 30 is generated and displayed on the monitor 9.

    Furthermore, as shown in FIG. 2, when the virtual camera 31 moves from the position (b) to the position (c), the image generation program PPP is acquired again as an image on the projection surface 32 d via the CPU 1. A routine for instructing itself to calculate the number of tree polygon models 30 and their positions is executed, and in response to this, the image generation program PPP executes step S2 in FIG. 5 again to execute the projection plane 32d. The tree polygon model 30 that should be acquired as an image is searched and calculated from the three model numbers 2, 3 and 4 up to the model numbers 2, 4 and 5. Although description of the calculation from step S3 to step S5 regarding the maximum number of drawn lines in FIG. 5 is omitted, the same processing as described above is performed and acquired as an image on the projection surface 32d after the position of the virtual camera 31 is changed. An operation for determining the tree polygon model 30 to be performed is performed.

    Then, the image generation program PPP arranges the tree polygon model 30 at the corresponding position on the field FLD from the model position information MDI for the model numbers 2, 4 and 5 via the CPU 1 and the image processing device 4. For the tree polygon model 30 of each model number, display information DIN corresponding to the arrangement position on the field FLD at the time of rendering by the virtual camera 31 is calculated (step S6 in FIG. 5).

    Further, as described above, the image generation program PPP monitors changes in the object acquired by the virtual camera 31 before and after the placement position of the virtual camera 31 in the three-dimensional virtual space is changed via the CPU 1. However, the change in the position of the virtual camera 31 causes the display information DIN to be newly calculated, and as a result of the movement of the virtual camera 31, the virtual camera 31 is out of the view volume 32c, and the memory of the RAM 3 An object that does not require display information DIN stored in the area is detected.

    That is, when the virtual camera 31 moves from the position (b) to the position (c), the objects acquired by the virtual camera 31 are changed from the model numbers 2, 3, and 4 to the model numbers 2, 4, and 5. . As a result, the image generation program PPP uses the CPU 1 as a new object to calculate the display information DIN, and the object with the model number 5 is outside the view volume 32c. An object having a model number of 1 is detected as an object that is no longer necessary. When there are a plurality of objects for which the display information DIN is no longer necessary, the object farther from the virtual camera 31 is detected and extracted with priority.

    Next, the image generation program PPP computes the display information DIN for the tree polygon model 30 that constitutes the object having the model number 5 via the CPU 1 from the detection result, and the computation result is displayed as an extracted display. In the memory area A in which the display information DIN for the object with the model number 1 that is no longer needed is stored, the display information DIN with the model number 1 is deleted, and the display information DIN with the model number 5 is newly added. Is updated as shown in FIG. 3B.

    That is, the tree polygon models 30 of model numbers 2 and 4 are already arranged on the field FLD, and the display information DIN is calculated and stored in the memory areas B and D of the RAM 3, so that the tree polygon model 30 The arrangement of the model 30 on the field FLD and the calculation of the display information DIN need only be performed for the tree polygon model 30 of model number 5. Then, the image generation program PPP is sent from the virtual camera 31 via the CPU 1 based on the display information DIN of the tree polygon models 30 with model numbers 2, 4, and 5 stored in the memory areas B, D, A of the RAM 3. An image obtained by rendering these three tree polygon models 30 is generated and displayed on the monitor 9. Since the tree polygon model 30 at the position of the model number 1 is already outside the range of the view volume 32c of the virtual camera 31, the display information DIN of the model number 1 is updated to the display information DIN of the model number 5. However, there is no influence on the image acquired by the virtual camera 31.

    Note that the position at which the virtual camera 31 acquires the images of the objects of the model numbers 2, 3, and 4 from the state where the images of the objects of the model numbers 2, 4, and 5 are acquired from the position (c) in FIG. In the case of returning to (b), the image generation program PPP has already stored the model numbers 5, 2, 3, 4 in the memory areas A, B, C, and D of the RAM 3 as shown in FIG. Since it is determined that the display information DIN is stored, the image generation program PPP does not detect an object for which the display information DIN must be newly calculated by changing the position of the virtual camera 31.

    As a result, the image generation program PPP does not need to recalculate the display information DIN for the model number 3 via the CPU 1, and the model numbers 2, 3, and 4 stored in the memory areas B, C, and D Based on the display information DIN, rendering is performed on the tree polygon model 30 arranged at the corresponding position, and an image to be displayed on the monitor 9 is calculated and acquired.

    In this way, every time the virtual camera 31 moves, an operation is performed to identify the tree polygon model 30 as an object that is acquired by the virtual camera 31 and displayed on the field FLD displayed as an image on the monitor 9. Only for the tree polygon model 30 as an object acquired by the virtual camera 31, the display information DIN is calculated and stored in a predetermined memory area. As a result, a fixed-size memory for displaying an object set in the RAM 3 with display information DIN that is always necessary for display, which is significantly smaller than the total number of fixed objects arranged on the field. It is only necessary to store in the area, and the storage area for the display information DIN of the polygon model composed of a plurality of polygons such as the tree polygon model 30 fixedly arranged on the field FLD can be greatly saved. .

    This technique is particularly effective when the number of polygon models 30 that are acquired by the virtual camera 31 and displayed on the monitor 9 at a time is as small as several polygon models 30 in a situation where the number of polygon models 30 arranged in the entire field FLD is large. Is particularly effective.

    In the case of the present embodiment, about 40 tree polygon models 30 are arranged on the field FLD, but the number of polygon models 30 acquired at a time as an image to be displayed on the monitor 9 by the virtual camera 31 is the number of polygon models 30 acquired. In the case of several, for example, two or three, a memory slightly larger than that (for example, four) is set as the maximum drawing number, so that the memory used for displaying the tree polygon model 30 is used. The area can be saved significantly compared to the case where display information DIN for all 40 tree polygon models 30 has been stored.

    In the above embodiment, the CPU 1 constitutes a game control device, and various means of the game control device are constituted by a combination of the CPU 1 and specific software. At least a part of these means is a logic circuit. It may be replaced. The present invention is not limited to a home game system, and may be configured as a game system of various scales.

    In the above-described embodiment, an example in which the tree polygon model 30 representing a tree is used as the polygon model is shown. However, the polygon model arranged on the field FLD is not limited to the tree polygon model 30, and a plurality of polygon models may be used. Any object such as a grass, a stone statue, or a monument may be used as long as it is an object that is composed of polygons and is fixedly arranged on the field FLD.

    The present invention can be used as an electronic game device using a computer and entertainment software to be executed by the computer.

FIG. 1 is a control block diagram of a game machine to which the present invention is applied. FIG. 2 is a schematic diagram illustrating an example of a plurality of fixed objects arranged in a three-dimensional virtual space. FIG. 3 is a schematic diagram showing an example of a display memory used when displaying the object of FIG. FIG. 4 is a schematic diagram illustrating a relationship between a virtual camera and a view volume. FIG. 5 is a flowchart illustrating an example of an object arrangement processing procedure.

Explanation of symbols

1 …… CPU
3 ... Memory 9 ... Monitor 20 ... Game device 30 ... Object (polygon model)
31 …… Virtual camera DIN …… Display information FLD …… Field GPR …… Game software

Claims (5)

Of a plurality of objects fixedly arranged on the field generated in the three-dimensional virtual space, only a predetermined number of objects or less are selectively acquired from the virtual camera arranged in the three-dimensional virtual space. A game program for causing a computer to execute a procedure to be displayed on a monitor,
The game program is stored in the computer,
A field generation procedure for generating the field for a character in the game to act in the three-dimensional virtual space;
For said predetermined number following objects to be displayed on the monitor, memory to ensure setting a display information storage area for storing display information corresponding to the position on the field of the object in a fixed size in the memory Area setting procedure,
Based on the fixed object arrangement position stored in the memory of the computer and the position of the virtual camera in the three-dimensional virtual space, the number of objects equal to or less than the predetermined number acquired by the virtual camera and the position thereof are determined. Search operation, object search procedure,
A display information calculation storage procedure for calculating the display information when the objects calculated by the object search procedure are arranged at respective positions on the field and storing the calculated display information in the display information storage area;
Based on the display information calculated and stored in the memory, an image to be displayed is generated for the objects of the predetermined number or less acquired by the virtual camera searched and calculated by the object search procedure, and is displayed on the monitor. Image generation display procedure to be displayed,
When the placement position of the virtual camera moves in the three-dimensional virtual space, a command for causing the object search procedure to search again for the number of objects equal to or less than the predetermined number acquired by the moved virtual camera and its position. procedure,
Game program for running. The game program according to claim 1, wherein the fixed object is a polygon model modeled from a plurality of polygons. The display information calculation storage procedure includes a procedure of calculating shading information and texture information as the display information when the object searched and calculated by the object search procedure is arranged at each position on the field. The game program according to claim 1, wherein: The game program is further stored in the computer.
A change detection procedure for monitoring the number of objects equal to or less than the predetermined number searched by the object search procedure and a change in the position before and after the placement position of the virtual camera in the three-dimensional virtual space is changed;
An object detection procedure for detecting an object for which display information should be newly calculated by the display information calculation storage procedure by changing the position of the virtual camera based on the monitoring result of the change detection procedure;
A display information calculation instruction procedure for instructing the display information calculation storage procedure to store the display information of the object which has been detected by the object detection procedure and for which display information must be newly calculated;
A game program for execution, according to claim 1, wherein the game program. Of a plurality of objects fixedly arranged on the field generated in the three-dimensional virtual space, only a predetermined number of objects or less are selectively acquired from the virtual camera arranged in the three-dimensional virtual space. A game device having means for displaying on a monitor,
The game device includes:
Field generating means for generating the field for the character in the game to act in the three-dimensional virtual space;
For said predetermined number following objects to be displayed on the monitor, memory to ensure setting a display information storage area for storing display information corresponding to the position on the field of the object in a fixed size in the memory Area setting means,
Based on the fixed object arrangement position stored in the memory of the computer and the position of the virtual camera in the three-dimensional virtual space, the number of objects equal to or less than the predetermined number acquired by the virtual camera and the position thereof are determined. Object search means for performing search operations,
Display information calculation storage means for calculating the display information when the object searched for by the object search means is arranged at each position on the field and storing it in the display information storage area;
Based on the display information calculated and stored in the memory, an image to be displayed is generated for the predetermined number or less of objects acquired by the virtual camera searched by the object search means, and is displayed on the monitor. Image generation and display means for displaying;
When the placement position of the virtual camera moves in the three-dimensional virtual space, a command for causing the object search means to search again for the number of objects equal to or less than the predetermined number acquired by the moved virtual camera and its position. means,
A game device having

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